feat: backlog code

behaviour_composite.cpp

@@ -0,0 +1,28 @@
+#include "behaviour_composite.h"
+
+void BehaviourComposite::_bind_methods() {}
+
+void BehaviourComposite::child_order_changed() {
+	this->child_behaviours.clear();
+	for (Variant var : get_children()) {
+		if (BehaviourNode * node{ cast_to<BehaviourNode>(var) }) {
+			this->child_behaviours.push_back(node);
+		}
+	}
+}
+
+void BehaviourComposite::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			child_order_changed();
+			set_leaf(get_child_behaviours().is_empty());
+			return;
+		case NOTIFICATION_CHILD_ORDER_CHANGED:
+			if (is_ready()) {
+				child_order_changed();
+			}
+			return;
+	}
+}